Mitsubishi Electric melsec q03ud(E)cpu, User Manual

Page: 24 / 220

22
CHAPTER 2
COMMUNICATION SPECIFICATIONS
The following are the communication specifications of the built-in Ethernet port of the CPU module.
*1 Straight cables can be used.
When the CPU module is directly connected to GOT with Ethernet cable, a cross cable of Category 5e or lower can also
be used.
*2 This number applies when a repeater hub is used.
When using a switching hub, check the number of cascaded stages with the manufacturer of the hub to be used.
*3 Use of STP cables is recommended in an environment with noise.
Hubs with 10BASE-T or 100BASE-TX ports
*4
can be used.
Up to 16 external devices can access one CPU module at the same time.
*4 The ports must comply with the IEEE802.3 10BASE-T or IEEE802.3 100BASE-TX standards.
● When connected to a hub, the CPU module determines the cable used (10BASE-T or 100BASE-TX) and the
communication mode (full-duplex or half-duplex) according to the hub.
Set the hub into the half-duplex mode if the hub that does not have the auto-negotiation function.
●
The operation of commercial devices used for the following applications is not guaranteed. Check the operation before
using the module.
• Internet (general public line)
(Internet-access service offered by an Internet service provider or a telecommunications carrier)
• Firewall device(s)
• Broadband router(s)
• Wireless LAN
● If Ethernet communication is performed with "Specify service process execution counts" selected for "Service processing
setting" in the PLC system tab of PLC parameter, a scan time increases by time for service processing (approximately
500ms).
To reduce it to 500ms or less, select an item other than "Specify service process execution counts".
(Example: Select "Specify service process time" and then enter a time value.)
●
If broadcast storm occurs in the network, scan time may be increased.
● If the destination device of the CPU module does not respond due to power-off or other reasons, Ethernet communication
of the CPU module may delay up to 500ms.
Item Specification
Transmission
specifications
Data transfer speed 100 or 10 Mbps
Communication mode Full-duplex or half-duplex
Transmission method Base band
Maximum distance between hub
and node
100 m
Maximum
number of
nodes/connection
10BASE-T
Cascade connection: Up to four
*2
100BASE-TX
Cascade connection: Up to two
*2
Number of
connections
TCP/IP Total of 16 for socket communication, MELSOFT connection, MC protocol, and
predefined protocol.
One for FTP
UDP/IP
Connection cable
*1
10BASE-T
Ethernet cable of category 3 or higher (STP/UTP cable)
*3
100BASE-TX Ethernet cable of category 5 or higher (STP cable)